<template>
  <div class="container">
    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="最终发布" />
    </el-steps>

    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>

    <!-- 章节 -->
    <ul class="chanpterList">
      <li v-for="chapter in chapterVideoList" :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
            <el-button type="text" @click="openVideo(chapter.id)">添加小节</el-button>
            <el-button type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
            <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
          </span>
        </p>

        <!-- 视频 -->
        <ul class="chanpterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p>
              {{ video.title }}
              <span class="acts">
                <el-button style @click="openEditVideo(video.id)" type="text">编辑</el-button>
                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title" />
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title" />
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right" />
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.isFree">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>

        <el-form-item label="上传视频">
          <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/eduVod/video/uploadVideo'"
            :limit="1"
            class="upload-demo"
          >
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
              <div slot="content">
                最大支持1G，
                <br />支持3GP、ASF、AVI、DAT、DV、FLV、F4V、
                <br />GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、
                <br />MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、
                <br />SWF、TS、VOB、WMV、WEBM 等视频格式上传
              </div>
              <i class="el-icon-question" />
            </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
  import chapter from "@/api/edu/chapter";
  import video from "@/api/edu/video";
  export default {
    name: "chapter",
    data() {
      return {
        saveBtnDisabled: false,
        courseId: "", //课程id
        chapterVideoList: [],
        chapter: {
          //封装章节数据
          title: "",
          sort: 0
        },
        video: {
          title: "",
          sort: 0,
          isFree: 0,
          videoSourceId: "", // 视频id
          videoOriginalName:''//视频名称
        },
        dialogChapterFormVisible: false, //章节弹框
        dialogVideoFormVisible: false, //小节弹框
        fileList: [],//上传文件列表
        BASE_API: process.env.BASE_API // 接口API地址
      };
    },
    created() {
      //获取路由的id值
      if (this.$route.params && this.$route.params.id) {
        this.courseId = this.$route.params.id;
        //根据课程id查询章节和小节
        this.getChapterVideo();
      }
    },
    methods: {
      //   ===========================视频操作=================================

      handleVodUploadSuccess(response, file, fileList) {
        // 上传成功
        //上传视频id赋值
        this.video.videoSourceId = response.data.videoId
        //上传视频名称赋值
        this.video.videoOriginalName = file.name
      },
      handleVodRemove() {
        // 监听删除
        video.removeVideo(this.video.videoSourceId)
          .then(res => {
            //提示信息
            this.$message({
              type: "success",
              message: "删除视频成功!"
            });
            // 清空视频列表
            this.fileList = []
            // 清空视频id,name
            this.video.videoSourceId = "";
            this.video.videoOriginalName = "";
          })
      },
      beforeVodRemove(file, fileList) {
        // 删除前
        return this.$confirm(`确认移除 ${file.name} ?`)
      },
      handleUploadExceed() {
        // 上传之前
        this.$message.warning('想要重新上传视频，请先删除已上传的视频')
      },

      //==============================小节操作====================================

      //删除小节
      removeVideo(id) {
        this.$confirm("此操作将删除小节, 是否继续?", "提示", {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }).then(() => {
          //点击确定，执行then方法
          //调用删除的方法
          video.deleteVideo(id).then(response => {
            //删除成功
            //提示信息
            this.$message({
              type: "success",
              message: "删除小节成功!"
            });

            //刷新页面
            this.getChapterVideo();
          });
        }); //点击取消，执行catch方法
      },
      //添加小节弹框的方法
      openVideo(chapterId) {
        // 初始化
        this.video = {
          title: "",
          sort: 0,
          isFree: 0,
          videoSourceId: "",
          videoOriginalName:''//视频名称
        };
        this.fileList = [];
        //弹框
        this.dialogVideoFormVisible = true;
        //设置章节id
        this.video.chapterId = chapterId;
      },
      //添加小节
      addVideo() {
        //设置课程id
        this.video.courseId = this.courseId;
        video.addVideo(this.video).then(response => {
          //关闭弹框
          this.dialogVideoFormVisible = false;
          //提示
          this.$message({
            type: "success",
            message: "添加小节成功!"
          });
          //刷新页面
          this.getChapterVideo();
        });
      },
      //修改小节弹框数据回显
      openEditVideo(videoId) {
        //弹框
        this.dialogVideoFormVisible = true;
        //调用接口
        video.getVideo(videoId).then(response => {
          this.video = response.data.video;
          // 文件列表添加数据
          if(this.video && this.video.videoSourceId) {
            this.fileList = [{name: this.video.videoOriginalName}];
          }
        });
      },
      // 修改小节
      updateVideo() {
        video.updateVideo(this.video).then(response => {
          //关闭弹框
          this.dialogVideoFormVisible = false;
          //提示
          this.$message({
            type: "success",
            message: "修改小节成功!"
          });
          //刷新页面
          this.getChapterVideo();
        });
      },

      saveOrUpdateVideo() {
        if (this.video.id) {
          // 修改
          this.updateVideo();
        } else {
          // 添加
          this.addVideo();
        }
      },

      //==============================章节操作====================================
      //删除章节
      removeChapter(chapterId) {
        this.$confirm("此操作将删除章节, 是否继续?", "提示", {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }).then(() => {
          //点击确定，执行then方法
          //调用删除的方法
          chapter.deleteChapter(chapterId).then(response => {
            //删除成功
            //提示信息
            this.$message({
              type: "success",
              message: "删除成功!"
            });
            //刷新页面
            this.getChapterVideo();
          });
        }); //点击取消，执行catch方法
      },
      //修改章节弹框数据回显
      openEditChatper(chapterId) {
        //弹框
        this.dialogChapterFormVisible = true;
        //调用接口
        chapter.getChapter(chapterId).then(response => {
          this.chapter = response.data.chapter;
        });
      },
      //弹出添加章节页面
      openChapterDialog() {
        //弹框
        this.dialogChapterFormVisible = true;
        //表单数据清空
        this.chapter.title = "";
        this.chapter.sort = 0;
      },
      //添加章节
      addChapter() {
        //设置课程id到chapter对象里面
        this.chapter.courseId = this.courseId;
        chapter.addChapter(this.chapter).then(response => {
          //关闭弹框
          this.dialogChapterFormVisible = false;
          //提示
          this.$message({
            type: "success",
            message: "添加章节成功!"
          });
          //刷新页面
          this.getChapterVideo();
        });
      },
      //修改章节的方法
      updateChapter() {
        chapter.updateChapter(this.chapter).then(response => {
          //关闭弹框
          this.dialogChapterFormVisible = false;
          //提示
          this.$message({
            type: "success",
            message: "修改章节成功!"
          });
          //刷新页面
          this.getChapterVideo();
        });
      },

      saveOrUpdate() {
        if (!this.chapter.id) {
          this.addChapter();
        } else {
          this.updateChapter();
        }
      },
      //根据课程id查询章节和小节
      getChapterVideo() {
        chapter.getAllChapterVideo(this.courseId).then(response => {
          this.chapterVideoList = response.data.list;
        });
      },
      //前一步
      previous() {
        this.$router.push({ path: "/course/info/" + this.courseId });
      },
      //跳转到第三步
      next() {
        this.$router.push({ path: "/course/publish/" + this.courseId });
      }
    }
  }
</script>

<style>
  .container{
    margin: 20px;
  }
  .chanpterList {
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .chanpterList li {
    position: relative;
  }
  .chanpterList p {
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #ddd;
  }
  .chanpterList .acts {
    float: right;
    font-size: 14px;
  }

  .videoList {
    padding-left: 50px;
  }
  .videoList p {
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #ddd;
  }
</style>
